I am a subject matter expert where I work. Most of my communication is written or through one-on-one conversations. However, speaking in front of a group terrifies me to the point that not only does my voice quiver, but I tremble and have facial spasms and trouble breathing. I know I look scared to death and it totally shifts the focus from my topic to whether or not paramedics should be called! It comes on suddenly. Generally a moment or two before I'm due to speak. My only saving grace is that after a moment or two I begin to calm down and am able to finish with at least some dignity. I'm very embarrassed and depressed for days afterwards. I am usually able to avoid public speaking situations, but when I can't I simply freak. I know as fact that if I can overcome my horrific fear of public speaking I would be at the top of my organization.